Statistical subtraction of the cluster and field CMDs. Panel a) shows the CMD for stars projected within 15″ of the cluster centre. Panel b) shows the CMD for off-cluster stars inside a region of 15″ radius at the south-east corner of the region. Panel c) shows the statistical subtraction of the two CMDs. In all figures, the isochrone for 30 Myr is plotted (solid red line), as is the same isochrone translated to account for twice the extinction caused by the Milky Way galaxy (dotted red line).